Itrader can and will reduce scamming. I think that this could solve many of sythe's problems and offer a way to prove you have done a trade. Here is the vB.org link http://www.vbulletin.org/forum/showthread.php?t=102965
Description:
iTrader for vB 3.5.x & 3.6.x has evolved from Trader Ratings for vB 3.0.x which evolved from Buy/Sell/Trade User Rating System for vB 2.x. This is a rating system for when members buy / sell / trade items from each other (presumably on a FS section of your forum). It is somewhat based on the honor system since there is no automatic way to truly tell if they did engage in a transaction. iTrader came about because it was a pain to try and maintain a single thread listing good / bad traders and so far has worked out quite well.
Features:
* Rate another member: Positive / Negative / Neutral
* Specify in each transaction: Buyer, Seller, or Trade
* Leave multiple comments about the deal
* Dates & IPs are all recorded to prevent abuse
* Specify a thread URL to the deal
* Advanced URL checking
* Display ratings over time
* Filter based on Buyer/Seller/Trade/or feedback they left for others
* Users can edit/delete ratings left for others (time based limitation)
* iTrader Admins can edit/delete anyone's ratings (just incase)
* PM notification when new rating or comment is left
* Per-usergroup permissions
* Lots of admin controllable options
Installation / Upgrade Info:
Read the included readme file, it explains everything.
Standard Disclaimer:
BACKUP YOUR DATABASE & FILES BEFORE IMPLEMENTING THIS HACK!!!
Donations:
This add-on will always be free, however your donations are kindly accepted and will help towards further development. The link is on the right under "The Developer" info.
Future Additions:
* AdminCP & ModCP Menus for searching IPs, stats, mass-prune, etc
* Better navigation across pages
* Better error descriptions
* Adjust action icons some
* Page to link two ratings manually
* AdminCP Option to choose how ratings are ordered (asc or desc by time)
* AJAX editing

















